Date registered: Feb 2015
Location: Kansas City
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
The ET30 is not stamped on the wheels, at least I did not see it anywhere. Perhaps Mercedes did not yet stamp the offset on their wheels back when these were made.
However, according to the internet the 1084001002 part number Bundt wheels all have an offset of 30mm, so I am just going off information found online.
The W114 is one of the models that these wheels came on stock, so I would guess they should fit without issues.